chore(deps): update actions/stale action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/stale	action	major	v4 -> v6

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Release Notes

actions/stale

v6

Compare Source

v5

Compare Source

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Configuration

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@8249ad7). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #63   +/-   ##
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  Coverage        ?   95.73%           
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  Files           ?       15           
  Lines           ?      211           
  Branches        ?       43           
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  Hits            ?      202           
  Misses          ?        9           
  Partials        ?        0           

Flag	Coverage Δ
unittests	95.73% <0.00%> (?)

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[renovate]

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